Re: [CAD_CAM_EDM_DRO] Re: Gantry X axis technology

Thanks for the info John. Do you know of any manufacturers of precision
rack & pinion drives?
I will search, but it always amazes me how many manufacturers are not on the
net.

Joe Fahy

----- Original Message -----
From: <machines@...>
To: <CAD_CAM_EDM_DRO@egroups.com>
Sent: Friday, December 08, 2000 5:25 PM
Subject: [CAD_CAM_EDM_DRO] Re: Gantry X axis technology


>
> --- In CAD_CAM_EDM_DRO@egroups.com, "Joe Fahy" <72510.1173@c...>
> wrote:
> > For x axis lengths of 16 to 20 feet, are there any non-custom
> machined ball
> > screws available? I have not seen any. The longest standard I
> have seen is
> > 12 feet.
> >
> > I have looked at the Bishop Wisecarver Lo-Pro timing belt based
> system.
> > However, with a 20 foot axis length, I have been told that zero
> backlash is
> > not possible. It is possible in shorter lengths, like 6 feet.
> >
> > What technology have other long x axis systems utilized and what
> compromises
> > have they lived with?
> >
> > Thanks,
> > Joe Fahy
>
> Some of the newer range of laser cutters with 4 metre beds, around 13
> ft, use precision rack and pinion drive.
> One of my customers has a 3 metre machine and the accuracy is plus or
> minus 0.02 mm
> The speed of these is far greater than the earlier range of ball
> screw driven machines.
>
> John Stevenson
> Notingham, England
>
>
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